Build Your Own Ajax Web Applications by Matthew Eernisse

By Matthew Eernisse

AJAX (Asynchronous JavaScript and XML) is a brand new method for constructing internet functions. It primarily allows clients to engage with a website with no forcing a sluggish & tedious reload of the full web page after each motion. this suggests internet purposes develop into extra responsive, more uncomplicated to exploit, and extra intuitive. construct your individual Ajax internet purposes makes use of a step by step instructional layout that is really easy to stick with, you can still construct refined and intuitive Ajax net interfaces very quickly! Get an summary of the fundamental applied sciences you will need to take advantage of to construct Ajax functions. comprehend the XMLHttpRequest item, the middle of Ajax functions. construct a cross-browser XMLHttpRequest wrapper so you might use in your entire Ajax initiatives.

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Simple, right? Now, let’s add some simple XMLHttpRequest code to our ScopeTest class. message. doTest = function() { // This will only work in Firefox, Opera and Safari. doTest(); So, what message is displayed? 1. message? ” But this has one small problem—its meaning changes when it’s called from outside the object. This is the result of something called execution context. info Processing the Response lers—runs in the calling object’s execution context. What this means is that, when you’re writing object-oriented JavaScript, you won’t be able to use the this keyword to refer to the object in code for event handlers (like onreadystatechange above).

If the code is within the correct range for a successful response, the onreadystatechange event handler passes the response to the response handler method (which is set by the handleResp property). The response handler will need to know what the response was, of course, so we’ll pass it the response as a parameter. We’ll see this process in action later, when we talk about the doGet method. Since the handler method is user-defined, the code also does a cursory check to make sure the method has been set properly before it tries to execute the method.

DoTest(); So, what message is displayed? 1. message? ” But this has one small problem—its meaning changes when it’s called from outside the object. This is the result of something called execution context. info Processing the Response lers—runs in the calling object’s execution context. What this means is that, when you’re writing object-oriented JavaScript, you won’t be able to use the this keyword to refer to the object in code for event handlers (like onreadystatechange above). This problem is called loss of scope.

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